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How does this work with Umbraco 7.2.1?

I installed this package in my (then) Umbraco 7.1.4 instance, but couldn't get it to work there. Because of some other issues I upgraded to 7.2.1, which resolved my other issues but didn't fix this. I also tried reinstalling to make sure that nothing went wrong there, but no luck.

My configuration is basically mapping every type of Document to itself, so I can build the required (for me) language links. I've read and re-read the documentation, but no luck. Anybody who can help me?

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